TriMark 500-1300 e-ASK, Manual

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Appendix B: Mounting e- ASK Components
This system uses low-voltage circuitry and wireless communication.
To protect these components and to ensure the device operates as
expected, these application notes must be followed.
General Mounting Guidelines:
Typical RF antenna implementation consists of a single wire from the
control module. To ensure optimal reception the RF antenna wire
should be designed to the following specifications:
Wire Length: 107.5cm +/- 1cm
Wire Type: 22AWG, Braided tined
The tip of the antenna wire should also be covered with heat shrink
tube or plastic dip to prevent the possibility of bare wire contacting
vehicle chassis locations and grounding the antenna.
The RF antenna should be placed in an interior location that does not
shield RF signals. You may need to try multiple locations to optimize
reception. The antennae must be left fully extended and exposed.
Minimize shielding from metal enclosures or chassis body panels that
could act as a ground plane.
Looping the antenna, wrapping the antenna around a metallic object,
or grouping the antenna wire in with another wire harness may affect
the functional operating range of the remote key fobs. Routing of the
antenna wire near wires with large or rapid voltage fluctuations may
also have a detrimental effect on the controller. If the antenna wire
must be routed with other wires due to vehicle design constraints,
care should be taken in harness manufacturing to ensure the antenna
wire is routed on the outside of the wire harness bundle and away
from wires that have large or rapid voltage fluctuations.
The vehicle control module contains several internal mechanical
relays. If a relay is exposed to excessive G-force loads (greater than
30 G), it could toggle unexpectedly. It is important that the control
module be mounted in a suitable location to prevent exposure to
excessive G-force loads. Examples of poor mounting locations include
on or inside doors, near chassis suspension features, or near internal-
combustion engines.
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